Run job from controller and report errors back

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I need to run job (Asynchronous) from within controller and report errors back to user...

Here's the scenario

- User uploads file from UI
- Controller runs asynchronous job which validates file which do some processing
and return.
- UI keeps polling to controller, If any error occurs during job running.. Controller keeps reporting errors back to UI
- Controller uses some sort of step listner

However I have following queries..

- What listner do controller need to implement to get errors from executing
steps

- How do controller pass the reference to uploaded file to Item reader ?

Thnx
SN

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Does any one has any idea ?